Must use native Workout app during exercise

From 1 to 4 stars because of devs rapid response to my feedback. When working out, you must start an exercise from the native Workout app within Apple Watch. This app only reports your heart rate from readings from Apples native Health app. Its a minor inconvenience to use another app to see heart rate during an exercise. Anyway, the dev really cares for this app.

cinemaloha about HeartWatch: Heart Rate Tracker